Power-driven tool.



MAM @M4 H. WAGNER. POWER vDRIVEN TOOL. APPLICATION FIL-ED MAY 22. |916.

Patented Feb. 13, 1917.

HUBERT WAGNER, OFGAUTING, NEAR MUNICI-I, GERMANY.

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Specification of Letters Patent.

Application filed May 22, 1916. Serial No. 99,260.

To all whom it may concern: Y

Be it known that I, HUBERT VAGNEma subject of the German Emperonandresiding at Gauting, near Munich, Germany,

tain new and useful improvements in powerdriven tools, and relates morespecifically to a novel combination tool, driven'by flexible shafting ineither direction and adapted to be used either as percusslve hammer,chisel or the like, or as rotary drill, and the invention essentiallyconsists of the construction, arrangement and cooperation of parts aswill hereinafter be fully described and claimed. 1

My improved tool is of the spring-hammer class, in which a plungerwithin'the cylindrical handle is reciprocatorily actuated in axialdirection by a rotor which is driven in suitable manner, for instance bya flexible shaft. From well known constructions of this type the presenttool diers in that the impulsion of the hammer-head Iplunger is notcaused by the action of a spring, but by having teeth on the crown oftheshaft-driven rotor act directly on similar facing teeth on the bottom ofthe driven plunger, the spring here being used foralways retaining thedriven plunger in operative contact with the rotor. Upon reversmg thedirection of power, the tool can be used as an ordinary drill, the setsof teeth intercoupling and the plunger then constituting also a rotor,and the two rotors rotating jointly.

The described arrangement of having'lthe rotor and the plunger extendco-axially of each other, serves to impart a strictly axially directedimpulsion to the active tool head and to reduce the wear to a minimum,since the evenly distributed ratchet teeth are all in usesimultaneously, so that a highly satisfactory operative effect isobtained.

In order to make my invention more readily understood, I will nowdescribe it in detail with reference tothe accompanying drawing, whichrepresents a longitudinal section through the tool, partly in elevation.

In the tubing a, which conveniently may serve as handle and which isclosed above and below respectively by the centrally perforated closuresal, a2, is loosely retained the rotor f which engages belowwith-thereonpling claw g and is rotated in well known manner, forinstance by thevexible shaft Z secured to the coupling member g. Theupper end of this rotor carries on its face a set of ratchet teeth el,which may be in one Patented nen. is, i917.

with the rotor or maybe provided'on a special head piece e, operativelyconnected to the rotor. Above this rotor is guided in vthe casing a andin the throat of the closure cap 0511 the drivenplunger b, whose lowerface is likewise provided with a set vof ratchet teeth d1, which mayalso extend from the lower face of a' special, exchangeable foot-pieced, instead of being worked right out of the plunger base. The upper endof the plunger shank is provided with a longitudinally extending recess11 into which extends loosely the set screw 7c threading in the wall ofthe top closure, for preventing hammering, but allowing freereciprocation thereof. A helical spring c, surrounding the plungershank, is put under tension upon each forward thrust of the plunger andtends to always return the plunger teeth into operative contact with therotor teeth. The chuck or socket la serves to receive the chisel,hammer, drill or the like.

The operation is the following :-On the power being turned on it istransmitted by the flexible shaft .Z to the clutch member g and in turn-to the'rotor.A The teeth of the latter, when traveling from right toleft in the direction of arrow l, in cooperating with the plunger teethimpartto the plunger a continuation of axial reciprocations, the springc alternately contracting and extending, and keeping the rotor andplunger always in close operative contact. The blows of the tool arestrictly axially directed and thus of the highest degree of eliiciency.

Ifthe tool is to be used as drilling device, the rotor f must be rotatedfrom left to right (arrow 2), when the two sets of teeth will formbetween thema clutch-coupling, and the member Z) willserve as drillspindle and rotate jointly with vthe rotor f. In this instance,obviously, the set screw 7c must be Vrotary displacement of the plungerwhen ing of practicallyV identical pitch and equal in number, means forretaining said plunger in yielding operative contact with said rotor,and means for preventing rotary movement but allowing axiallyreciprocatory movement of said plunger relative to said easing.

2. In a tool of the lcharacter set forth, the combination of a casing, arotor therein adapted to be power-driven in either direction, a headpiece to said rotor and ratchet teeth on said head piece,v atool-receiving plunger in said casing, a foot piece to said plunger andratchet teeth on said foot piece, saidrotor and said plunger With theirrespective toothed end pieces all being in axial v alinement, resilientmeans for allowing said plunger to ascend the height of said teeth butretaining it always in operative contact with said rotor, the said twosets of prac-v tically identically shaped and disposed ratchet teeth inconjunction With said resilient means allowing said rotor to operate vonsaid plunger in a reciproea'tory lifting manner when rotating in the onedirection,

and in a rotary manner When revolving in 2 the opposite direction, andmeans for preventing at Will rotary movement of said plunger relative toits casing.

3. In a tool of the character'set forth, the combination of a casing, arotor therein adapted to be power-driven in either direction, ratchetteeth on said rotor, a tool-receiving plunger in said casing, ratchetteeth on said plunger, the said-sets of ratchet teeth cooperating Witheach other either slip- 3 pingly or couplingly according to thedirection of "drive, a helical spring encircling the shank of saidplunger and tending to yieldingly press the said plunger teeth home onthe said rotor teeth, and releasable means for f1 preventing the saidplunger from rotating `Within its casing.

ln testimony whereof I aiX my signature in presence of two Witnesses.

' HUBERT WAGNER. Witnesses:

W. S. SPEGITTERY, HARRY SGHMID.

Co'piesof this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

' Washington, D. C.

